Finding the Fourth Proportional to 2,162.72, 2,984.70 and 1,231.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.72 : 2,984.70 = 1,231.28 : x
2. Step 2: Convert to fraction form
   2,162.72/2,984.70 = 1,231.28/x
3. Step 3: Cross multiply
   2,162.72x = 2,984.70 × 1,231.28
4. Step 4: Simplify right side
   2,162.72x = 3,675,001.42
5. Step 5: Solve for x
   x = 3,675,001.42/2,162.72
6. Step 6: Final answer
   x = 1,699.25